max. diameter of forged rings: 5 meters. Main market:Europe,America, India... Test reports ... properties(yeild strength,tensile strength,elongation,reduction of area)C Heat treatment(normalized,tempered,quenched,anneal)D Hardness(standard:NACE MR0175 ... /X30Cr13/X35CrMoV5/50CrMo4/C45E/C60E/C55E/20MnGr5/GCr13/17CrNiMo6/18CrNiMo7 forged bar/shaft